1 Explain that a population pyramid shows the age and sex structure of a population. 2  Point to the horizontal bars, which show the percentage (or the absolute number) of males and females in each age group. 3  Have students interpret the chart.
1 Although they range from $150-$400 or more, a large capacity (25-70 pints) dehumidifier for a basement (the dampest portion of most homes) or other large area averages $200-$300.
In some cases, a dehumidifier can be useful for lowering humidity levels in the sealed crawl space of a newly built home. However, I see the use of a dehumidifier in this location as a temporary measure. Once the crawl space has dried out, it should be possible to remove the dehumidifier from the crawl space.